There are stories of “Shoiseks” in a lot of Yiddesher History.
The renowned Chortkov Chassidus had 2 documented such people.
There was Harav Nuchem Shoisek who lived in Chortkov and was part of the first Rebbes Admor Reb Dovid Moshe MiChortkov closest people. He only spoke in learning for the last 40 years of his life earning him this title.
There was also Reb Yisroel Shoisek that lived in the times of the second Rebbe Admor Reb Yisroel and remained there after the Rebbe left to Vienna before the first World War.